webserver with temperatur chart on Arduino

Projects General Guidance
1

Hi,

I´m searching a simple chart, that is running on the webserver example ON the Arduino Mega with ethernet-shield+Wlan and a Android-Handy as monitor; i.e. not connected to any real internet. Prefferably not on the SD-card but "in-memory-code".
I want to display 3 temperatures over time (maybe rolling last 24h-array may be sufficient).
Main purpose is to see tendency like "increase", "decrease" over time of each graph.
Hope anybody can help in this.

Thanks a lot,
Barny

2

Could work if you do the charting in JavaScript (p.e. http://www.chartjs.org/) on the client and just read the values from the Arduino. I would use the SD card to store the HTML, CSS and JavaScript files, will make the code much cleaner. A circular buffer is not hard to implement, look at the HardwareSerial.cpp code if you want a simple example.